Index of $\Gamma$-equivariant Toeplitz operators

Ryszard Nest, Florin Radulescu

Let $\Gamma$ be a discrete icc subgroup of PSL(2,R) of infinite covolume. and let M denote the quotient of the unit disc by $\Gamma$. We prove that a Toeplitz operator with $\Gamma$-invariant sym…